Crystal structure of di­aqua­bis­(2,6-di­methyl­pyrazine-κN)bis­(thio­cyanato-κN)cobalt(II) 2,5-di­methyl­pyrazine tris­olvate

In the crystal structure of the title compound, [Co(NCS)(2)(C(6)H(8)N(2))(2)(H(2)O)(2)]·3C(6)H(8)N(2), the Co(II) cation is coordinated by two terminally N-bound thio­cyanate anions, two water mol­ecules and two 2,6-di­methyl­pyrazine ligands, forming a discrete complex with a slightly distorted octa­hedral N(4)O(2) coordination environment. The asymmetric unit contains one Co(II) cation and three halves of 2,5-di­methyl­pyrazine solvate mol­ecules, all entities being completed by inversion symmetry, as well as one thio­cyanate anion, an aqua ligand and a 2,6-di­methyl­pyrazine ligand, all in general positions. In the crystal, discrete complexes are arranged in a way that cavities are formed where the noncoordinating 2,5-di­methyl­pyrazine mol­ecules are located. The coordination of the latter to the metal is prevented due to the bulky methyl groups in vicinal positions to the N atoms, leading to a preferential coordination through the 2,6-di­methyl­pyrazine ligands. The complex mol­ecules are linked by O—H⋯N hydrogen bonds between the water H atoms and the N atoms of 2,5-di­methyl­pyrazine solvent mol­ecules, leading to a layered structure extending parallel to (100).